How Using My Oppai Skill to Enlarge My Sister’s Breasts Led to Building a Harem - Chapter 40
Chapter 40
I’ve become lovers with Rosecia and Leonora, a shift that’s transformed my perspective on love and boosted my confidence as a man.
The proof? I’m pushing forward with another woman I’ve been hesitant about—
“Aa… Master…♡ …Nn♡”
“Akane-san… I took your first, didn’t I…?”
Every day, Akane-san drives me to school. Until now, our routine involved her giving me blowjobs, but…
“I’m moving…”
Zu♡ Chyu♡ Zu♡ Chyu♡
“Naa♡ My hymen’s torn…♡ But it feels so good…♡”
The Saionji family’s car has a spacious backseat, perfect for sex.
“You’re adorable, Akane-san—chu…”
“Ah… Master…♡”
I’ve always found Akane, the maid, cute and wanted to be intimate with her. And I’ve stopped lying to myself.
“From now on, let’s do this every day… Haa… Haa…!”
Zuchu♡ Zuchu♡ Zuchu♡ — Paan♡ Paan♡ Paan♡
“A, Master…! An…♡ If you’re that rough…”
“It’s fine. No one’d guess we’re having sex in a car this early.”
Even a luxury car sways during intense sex. Right now, it’s rocking slightly up and down.
Paan♡ Paan♡ Paan♡ Paan♡
“Master…♡ You’re wonderful…”
“You’re mine now, Akane-san, right?”
“Yes…♡”
Caught up in the moment, we stripped and dove into passionate morning sex. It grew so wild the car’s bouncing was noticeable.
“Aa♡ Aa♡ Aa♡ Aa♡ Amazing…♡”
Panpan♡, my hips slammed into her pussy, driving us both higher.
“Then I’ll take your first creampie too.”
“Aa… Aaaa…♡ I-I’m cumming~~~♡♡♡”
I didn’t fight the rising urge, letting it go. Semen shot from my cock, flooding her vagina white.
“Haa…♡ It’s coming…♡ Your precious seed…♡”
“Nn… Aa… Feels so good, Akane-san…”
“Auu…♡ Still coming… Aa, cumming~~~♡”
She came repeatedly. Was her sensitivity this high despite being a virgin—or was it something else?
“Your cock… It’s amazing…♡”
“You like it that much?”
“I’m so happy…”
“Haha, then I’ll make you happy every day, okay?”
Thus, morning sex with Akane-san before school became my daily ritual.
※
“Hey, morning, Yukino, Riria. You two look cute today.”
“Oh, morning…♡”
“Morning. You’ve… changed lately, haven’t you?♡”
“Have I?”
My mindset’s shifted—I’m being true to myself, and I’ve gained confidence.
“You’ve got this… sexy vibe now. Different from other guys. Look at the class,” Riria said.
“Hm…?”
Sure enough, the girls in class were sneaking glances, fidgeting.
(I’m getting a lot of attention…)
Before, I’d have panicked, but now I feel nothing like that.
(Being noticed by girls isn’t bad…)
Far from flustered, I’m almost enjoying it.
“You’ve grown up,” Yukino said.
“Yeah, you’re practically a celebrity here,” Riria added.
“Haha, thanks. That famous, huh?”
Riria’s tuned into the girls’ gossip, and apparently, my popularity’s spiked. I’ve got a fanbase now.
“You’re high on the unofficial hot guy ranking,” she said.
“What’s that?”
I was flattered but weirded out by such a thing existing.
(Plus, there’s a problem… Too much attention means…)
It’s harder to have sex at school. Sneaking off with Yukino and Riria every break is too suspicious. I’ll have to cut back, but my libido’s only growing—I might not hold out long.
As I mulled this, a female student stormed into our classroom, shoulders tense.
She scanned the room, locked eyes with me, and marched over.
(What’s this…? She looks familiar…)
“Hey, you!” she snapped.
“Me…?”
“Yes, you! Why haven’t you shown up to the student council!?”
“…What do you mean?”
She sighed, exasperated. Apparently, she’s Maki Takagishi, a third-year and student council president. According to her, it’s an unwritten tradition that the top second-year from the first exam joins the council to serve the students.
“I didn’t know… I was average until recently,” I explained.
“I never expected the top scorer to skip out,” she huffed.
That might be common knowledge among high-achievers, but I study for my own goals, not for council duties I never heard of.
“Fine. Just show up once, got it?”
“Alright, but I can’t promise I’ll join.”
I’ve got my own priorities. If the council’s too demanding, I’ll pass.
So, I agreed to visit the student council room later—a decision I couldn’t have known would lead to a new sex spot.
※
I was back at the Tsukihara house.
“Onii-chan♪”
“Studying properly?”
“…Yup. Totally.”
She hadn’t studied at all.
But I wasn’t here to nag.
“Thanks for the advice the other day.”
“Hm? About taking responsibility?”
“Yeah.”
“It was like I said, right? You were being too soft.”
“???”
We weren’t quite on the same page. I explained what Rosecia taught me—how I needed to change myself.
“I don’t overthink it,” Nao said.
“Really?”
“Love’s about feelings. Wanting to be together because you love someone—no one can stop that.”
Maybe, like ancient humans, it’s as simple as being together because you love. Modern folks like me might overcomplicate it, assuming marriage is the goal.
“You’re wise, Nao. Sharp intuition, maybe?”
“Dunno.”
“If you could apply that to studying…”
“That’s it! Okay!”
Inspired, she opened her workbook, staring intensely.
“Mmm…”
“Tough problems need insight…”
She meditated like a monk.
“Mmmmm…”
“No good?”
“Muu… Yeah, no way.”
Life’s not that easy. Still, she learned something.
“I’ll coach you today.”
“Ehehe, I can totally try hard then♪”
“Good girl.”
Her cuteness made me soft.
“Do good, and I get a reward, right?”
“Haha, nail it, and we’ll have lots of sex.”
I patted her head. Fired up, she focused, absorbing everything I taught.
…
“Alright, let’s call it a day.”
“Haa~ Finally done~”
Even athletic Nao gets mentally drained. But with studying done—
“Let’s have sex, Onii-chan♪”
“Haha, you earned it.”
“Ehehe~ Oh, wait!”
She remembered something, grabbed an item from her closet, and grinned.
“Turn around, Onii-chan.”
“Sure.”
Rustling sounds of changing clothes followed.
“Okay, look!”
“Wow, cute! What’s it… Magical girl?”
“Yup! It’s the Magical Girls Alte & Orte cosplay~♪”
Right, I recognized it—an anime heroine’s outfit. I’m no anime buff, but I’d seen it in a game collab event.
“Super cute, but where’d you get it?”
“Secret~♪”
“Wha~?”
I had a suspect—only one person Nao knows could source this.
“Doesn’t matter. Do I look good?”
“Adorable. Way cuter than the original.”
“R-Really…? For real?”
“Yup. Look, I’m already like this.”
I showed her my rock-hard bulge, straining my pants.
“Geez♡ You’re such a perv, Onii-chan♪”
“Yup. I’m a horny guy who loves girls like you.”
“Haha, guess I’ve got no choice?”
“Let’s get to it, Nao!”
I stripped quickly, pouncing on the magical girl with unrestrained desire.
“An♪ Getting ravaged by a naughty monster Onii-chan♡”
“Your fault for being too cute!”
“Kya♡”
I grabbed her rear, pinning her to the desk, prepping for entry.
“Monster tentacles incoming!”
“Yahn♪ No, no~♪”
“Here… Uaa…!”
Gripping her soft, white rear, I slid my meaty tentacle into her tight pussy.
Nyuru♡ Nyururuu~~~♡
“A, yahn♡ Onii-chan monster’s naughty thing’s inside me~♡”
“Nao…! Aa… Nao… I love you…”
Munyu♡ — Pachun♡ Pachun♡ Pachun♡ Pachun♡
I gripped her smooth rear, pulling her close while thrusting hard.
(Uaa… So soft… Her rear, her pussy… Perfect.)
“Onii-cha… Aan♡ Pound me more♡”
“So cute… Haa! Aa!!”
Paan!! Pan♡ Pan♡ Paan♡♡
Her overwhelming cuteness captivated me, driving my hips relentlessly.
“Nn~~~♡ So… Good…~~~♡”
“Love you. Love you… Love you!!”
“An♡ I love you… The most in the world♡”
(What a girl… Sex with her is the best.)
Her sweet, melting voice and the scent of her sweat ignited my lower half.
“Ooo!! I want you, Nao…! I love you so much I can’t stand it!!”
Paan♡ Paan♡ Paan♡ Paan♡ Paan♡
“Aa♡ Aa♡ Aa♡ Take me, Onii-chan♡”
“I’m taking you! All of you… I’ll cherish you forever!!!”
“Aha, haa…♡ So happy… Aa, aa… Cumming, cumming~~~”
As she declared her climax, I pulled her arms, delivering my hardest thrusts yet.
Dochu♡ Dochu♡ Dochu♡ Dochu♡ — Dochun!!!
“Aa… —Aaaa~~~♡♡♡”
Nao’s knees buckled as she peaked. My cock erupted, flooding her pussy with semen.
“You’re mine forever, Nao…”
“Yup… Yup… Cherish me always, okay…?”
“Of course, Nao… Chu.”
“Chuu♡… You’re amazing, Onii-chan…♡”
We kissed, basking in sweet happiness.
“Today, I’ll make you so happy you’ll pass out.”
“Aan♡ You’re such a monster perv…”
“That’s the real me, Nao.”
“Yup♪ I like this you better♡ No matter what, I’m on your side♡”
Her adorable smile drove me to ravish her until she ascended from bliss.
※
With Miyabi-san busy, Rosecia’s taken over tutoring me, especially in history, politics, and economics. As a reigning queen, her knowledge surpasses even Miyabi-san’s.
“Thus, religious reforms in various nations reshaped political systems,” she explained.
“England’s divorce drama led to the Church of England, paving the way to global dominance,” I said.
“Exactly. Politics and religion are intertwined. Even today, some spread ideologies on SNS, no?”
“Yeah, they call it ‘updating values’… Is that a kind of reformation?”
“Precisely. To disrupt systems, redefine justice, incite the masses, and grow followers.”
(Not all are bad, but most seem problematic…)
“Human nature hasn’t changed since the Middle Ages, has it?”
“Then and now, humans are humans—genetically identical.”
To a ruler, the spread of cult-like ideas in modern times must be terrifying. I never considered governance seriously, not aiming to be a politician, but her struggles were beyond my imagination.
“By the way, husband,” she said, switching from teacher to lover.
“What’s up, Rosecia?”
“What’s this child’s name?”
“Huh? Child?”
“Mine and yours.”
She stroked her womb fondly.
“You’re… pregnant?”
“Kukuku… Naturally. That night was intense.”
That night—when I lost reason in the palace.
“Not just me. Many girls conceived then.”
“No way…?”
“I told you, pao fruit extract is a potent tonic. With such thick seed, of course they’d conceive.”
“No contraception…?”
“No such culture in my country. Children are treasures—conceived, they’re joyfully born.”
Even so… what do I do?
“Right, Leonora?”
“Yes, Your Majesty. I’d like a name for my child too.”
“You too, Leonora?”
“Of course♡ That night was wild.”
Unbelievable. Leonora’s pregnant too?
“I… I…”
“Don’t fret. Any seed’s child is a national treasure, well-protected.”
“I see…”
“But brace for demands for second and third children♪”
“Ugh…”
If I go to Waheide, a crowd of women with my babies might await—a mix of joy and dread.
“Don’t overthink it. Worry about yourself first, husband.”
“Yeah… Oh, ‘husband’ means that.”
“Kuhaha! My husband, king-consort. Be honored.”
“I am. But marriage…?”
“I don’t seek it here. Only in Waheide.”
“Right. Paperwork…?”
“None needed.”
Polyamory—managing relationships would be chaos. As the approver, she needs no process. Her word makes us spouses instantly. In Waheide, I’d be a king-consort.
“You’ll be addressed as Your Highness,” Leonora teased.
“Wha!? I’m a commoner!”
“No longer♪” Rosecia laughed.
She was joking, but I’d be treated like quasi-royalty. In Japan, titles don’t matter.
I thought the talk was over when—
“Nii-cha♪ Done studying?”
“Hey, Maya. Just finished.”
“Wanna play?”
“Daughter, you’re in Her Majesty’s presence,” Leonora scolded.
“Ah… Sorry, Queen.”
Maya’s wary of Leonora, who oversaw my abduction. Crestfallen, Maya shrank, but Rosecia said something odd.
“Maya, your energy’s good. But shouldn’t you start caring for your body?”
“!?”
“What’s that mean?”
I looked between them, confused.
“What, she hasn’t told you, husband?”
“Huh…”
“What—”
“You made a child with Maya too, didn’t you?”
“—Ah…”
Waheide’s open culture skewed my senses—I never used protection. Of course she’d conceive.
“Ehehe~ Got a baby♪” Maya beamed.
“I see… Uh… What now…?”
“I’ll have it!”
I was happy, but… Is it right for someone her age to give birth?
“Let her. Age doesn’t matter in our country,” Rosecia said.
“Hmm…”
“Maya’s body is ready. No issue.”
“Alright. It’s our child… We’ll raise it with love.”
“Yay!”
Carla’s consent is needed, but Maya’s radiant smile filled me with joy.
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